Alert archive / Florida / Freeze Warnings in 2021
Freeze Warning 2, NWS Jacksonville, FL
NWS Jacksonville, FL issued this freeze warning at Jan 16, 2021, 1:49 PM EST for Alachua County, Bradford County, Nassau County, Florida. It took effect at Jan 17, 2021, 1:00 AM EST. It was in force for 8 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jan 16, 2021, 1:49 PM EST (18:49 UTC)
- In effect from
- Jan 17, 2021, 1:00 AM EST
- Expired
- Jan 17, 2021, 8:56 AM EST
- In force
- 8 hr
- Issued by
- NWS Jacksonville, FL
Counties Alachua County, FL, Bradford County, FL, Nassau County, FL
The radar
The Jacksonville radar (KJAX), 59 km from the middle of the area, began a volume at 18:48 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Jacksonville, FL (KJAX), launched 12:00Z, 6.8 hours before the alert went out and 61 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2105 m above ground
- 0-6 km bulk shear
- 111 kt
- 0-1 km storm-relative helicity
- -105 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
676 WWUS72 KJAX 161849 NPWJAX URGENT - WEATHER MESSAGE National Weather Service Jacksonville FL 149 PM EST Sat Jan 16 2021 FLZ024-025-031-032-136-236-171400- /O.UPG.KJAX.FZ.A.0002.210117T0600Z-210117T1400Z/ /O.NEW.KJAX.FZ.W.0002.210117T0600Z-210117T1400Z/ Inland Nassau-Inland Duval-Bradford-Clay-Eastern Alachua- Western Alachua- Including the cities of Ratliff, Hilliard, Kings Ferry, Bryceville, Normandy, Ortega, Riverside, San Marco, Starke, New River, Doctors Inlet, Lakeside, Bellair, Middleburg, Orange Park, Gainesville, Gainesville Airport, Newnans Lake, High Springs, Newberry, and Archer 149 PM EST Sat Jan 16 2021 ...FREEZE WARNING IN EFFECT FROM 1 AM TO 9 AM EST SUNDAY... * WHAT...Sub-freezing temperatures as low as 31 expected. Frost is also expected. * WHERE...Inland Nassau, Inland Duval, Bradford, Clay, Eastern Alachua and Western Alachua Counties. * WHEN...From 1 AM to 9 AM EST Sunday. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Appropriate action should be taken to ensure tender vegetation and outdoor pets have adequate protection from the cold temperatures. Young children, the elderly and the homeless are especially vulnerable to the cold. Take measures to protect them. && $$ FLZ033-037-038-124-125-133-138-140-240-340-171400- /O.CON.KJAX.FR.Y.0002.210117T0600Z-210117T1400Z/ Inland St. Johns-Putnam-Inland Flagler-Coastal Nassau- Coastal Duval-Coastal St. Johns-Coastal Flagler-Eastern Marion- Central Marion-Western Marion- Including the cities of Fruit Cove, Switzerland, Bakersville, Picolata, Bostwick, Carraway, Palatka, Bunnell, Espanola, Andalusia, Amelia City, Fernandina Beach, Yulee, Arlington, Jacksonville, Oceanway, Tallyrand, Ponte Vedra Beach, Durbin, Palm Valley, Anastasia, Saint Augustine, Palm Coast, Lynne, Moss Bluff, Anthony, Burbank, Ocala, Weirsdale, and Ocala Airport 149 PM EST Sat Jan 16 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM EST SUNDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Eastern Marion, Coastal Nassau, Coastal St. Johns, Central Marion, Western Marion, Putnam, Inland Flagler, Coastal Duval, Inland St. Johns and Coastal Flagler Counties. * WHEN...From 1 AM to 9 AM EST Sunday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
1 follow-up statement
948 WWUS72 KJAX 171356 NPWJAX URGENT - WEATHER MESSAGE National Weather Service Jacksonville FL 856 AM EST Sun Jan 17 2021 FLZ024-025-031-032-136-236-171500- /O.CAN.KJAX.FZ.W.0002.000000T0000Z-210117T1400Z/ Inland Nassau-Inland Duval-Bradford-Clay-Eastern Alachua- Western Alachua- Including the cities of Ratliff, Hilliard, Kings Ferry, Bryceville, Normandy, Ortega, Riverside, San Marco, Starke, New River, Doctors Inlet, Lakeside, Bellair, Middleburg, Orange Park, Gainesville, Gainesville Airport, Newnans Lake, High Springs, Newberry, and Archer 856 AM EST Sun Jan 17 2021 ...FREEZE WARNING IS CANCELLED... $$ FLZ033-037-038-124-125-133-138-140-240-340-171500- /O.CAN.KJAX.FR.Y.0002.000000T0000Z-210117T1400Z/ Inland St. Johns-Putnam-Inland Flagler-Coastal Nassau- Coastal Duval-Coastal St. Johns-Coastal Flagler-Eastern Marion- Central Marion-Western Marion- Including the cities of Fruit Cove, Switzerland, Bakersville, Picolata, Bostwick, Carraway, Palatka, Bunnell, Espanola, Andalusia, Amelia City, Fernandina Beach, Yulee, Arlington, Jacksonville, Oceanway, Tallyrand, Ponte Vedra Beach, Durbin, Palm Valley, Anastasia, Saint Augustine, Palm Coast, Lynne, Moss Bluff, Anthony, Burbank, Ocala, Weirsdale, and Ocala Airport 856 AM EST Sun Jan 17 2021 ...FROST ADVISORY IS CANCELLED... $$
The office that day
Everything else NWS Jacksonville, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 16, 2:56 AM EST | Frost Advisory | JAX | Duval, Flagler, Marion, Nassau | 30 hr |
| Jan 16, 2:56 AM EST | Freeze Watch | JAX | Alachua, Bradford, Nassau | 11 hr |
Nearby
Freeze Warnings in Florida, 2021Every freeze warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.